Two fuse wires (42a, 42b) hold an insulator hub (34) in place which, in turn, retains a hook-shaped release end (32) of a restraining wire (28). The insulator hub is provided with two grooves (36a, 36b), one for fuse wire (42a) and one for fuse wire (42b), and with a center hole (38) midway between the grooves. A lanyard (35) is terminated at its ends by a pair of loops (35a, 35b). Loop (35b) is secured through center hole (38) in the insulator hub. The fuse wires are connected to two power supplies (48, 52) which are employed as a redundant power supply or fusible link decoupling device (50). Restraining wire (28) is wrapped around and holds together a pair of spool halves (16, 18) of a frangible actuator (12). A release pin (76) has a head portion (86), which is captured between the spool halves, and a shaft portion (86). A load, as represented by an arrow-headed line (88), exerts a force upon the release pin tending to move it away from frangible actuator (12). Current from either of the power supplies can cause a failure of its connected fuse wire which, upon failure, releases the insulator hub from being held in place. Release of the hub in turn frees restraining wire end (32) and permits the spool halves to separate under exertion of the load, as denoted by arrow-headed line (88). Should one power supply fail for any reason, current will also flow from the other power supply through its connecting wire to cause a failure of its fuse wire. Additional fuse wires (42a', 42b') may be parallelly added to fuse wires (42a, 42b) to preclude premature separation of restraining wire (28) from the hub.